EP 0851574 A1 19980701 - Two-output low-noise down converter circuit
Title (en)
Two-output low-noise down converter circuit
Title (de)
Rauscharme abwärtsumsetzerschaltung mit zwei Ausgängen
Title (fr)
Circuit convertisseur à faible bruit à deux sorties
Publication
Application
Priority
JP 35045196 A 19961227
Abstract (en)
The invention provides a two-output low-noise down converter circuit which is improved in the isolation between two outputs. In the two-output low-noise down converter circuit, an input signal is divided into two divisional signals of different polarization systems and then the divisional two signals are processed by two-system signal processing circuits which comprise low-noise amplifiers 2a, 2b, band-pass filters 3a, 3b, frequency converter circuits 5a, 5b and a local oscillator 4, respectively. The two-output low-noise down converter circuit includes: a switching circuit 11 for performing switching control on the outputs of the two signal processing circuits responsive to the voltages applied to two output terminals 8a, 8b, and for selectively outputting two polarized signals to its output terminals; intermediate frequency amplifiers 12a, 12b for amplifying the two outputs of the switching circuit 11 and leading out the resulting outputs at the two output terminals 8a, 8b; and a control circuit 9 for controlling the turning-on and -off of the power of the intermediate frequency amplifiers 12a, 12b responsive to loads of the two output terminals 8a, 8b. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
H03D 7/165 (2013.01 - EP US); H03D 7/166 (2013.01 - KR); H03D 7/18 (2013.01 - KR); H03G 1/0088 (2013.01 - KR); H04B 1/30 (2013.01 - KR); H04H 40/90 (2013.01 - EP US)
Citation (search report)
- [A] US 5345591 A 19940906 - TSURUMAKI TAKAYOSHI [JP], et al
- [A] EP 0300173 A2 19890125 - SHARP KK [JP]
- [A] PATENT ABSTRACTS OF JAPAN vol. 095, no. 004 31 May 1995 (1995-05-31)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0851574 A1 19980701; EP 0851574 B1 20020410; DE 69711834 D1 20020516; DE 69711834 T2 20021107; JP 3414604 B2 20030609; JP H10190506 A 19980721; KR 100289106 B1 20010502; KR 19980064052 A 19981007; TW 428374 B 20010401; US 6009304 A 19991228
DOCDB simple family (application)
EP 97309049 A 19971111; DE 69711834 T 19971111; JP 35045196 A 19961227; KR 19970068005 A 19971212; TW 86115664 A 19971023; US 96382197 A 19971104